Telephone dial lock



Dec. 5, 1933. J. JACKSON TELEPHONE DIAL LOCK Filed Nov. 1, 1932 PatentedDec. 5, 1933 PATENT OFFICE TELEPHONE DIAL LOCK Joseph Jackson,

Pittsburgh, Pa.

Application November 1, 1932. Serial No. 640,717

1 Claim.

This invention relates to dial locks for automatic telephones, and inaccordance with the present invention a lock for the above mentionedpurpose is provided that will effectively prevent unauthorized use ofthe telephone without interieiing with incoming calls.

The invention further comprehends the provision of a lock for dialtelephones which will prevent unauthorized removal of the hook usuallyprovided as a stop for the finger while the dial plate is being rotatedin making a call.

The invention together with its numerous objects and advantages will bebest understood from a study of the following description, taken inconnection with the accompanying drawing wherein:

Figure 1 is a side elevational View of the base portion of an automatictelephone oi the desk type and showing the dial lock applied thereto.

Figure 2 is a top plan view, the dial lock being shown in appliedposition.

Figure 3 is a perspective view of a dial lock plate, and

Figure l is a sectional view taken substantially on the line 4-4 ofFigure 2.

Referring to the drawing by reference numerals, 10 designates the baseportion of a desk telephone of the automatic dial calling type, 11 thetransmitter supporting post or standard, 12 the circular base upon whichis mounted for rotation the dial 13 provided with the finger openings 14while the upwardly and inwardly projecting hook 15 which serves as afinger stop while the dial plate is being rotated in making a call isshown secured to the base 12 through the medium of screws 16.

The improved dial lock comprises an arcuate plate 17 that has formedintegral with its outer a depending curved plate or flange 18.

plate 17 is provided adjacent one end thereof with an aperture 19adapted to coincide with one of he finger openings 14. At said one endof the plate is mounted a lock 20, the barrel of which is secured to theplate 17 through a the medium of screws 21, plate 1'7 adjacent theflange edge thereof being provided with openings 22 for accommodatingthe screws 21. The olt of the lock is designated by the referencecharacter 23, and is adapted to extend through the opening 19, and theopening 14 in line with the opening 19, and when the bolt 23 is turnedto move into locking position the latch lug 24 thereof, as shown inFigure 4 unauthorized removal of the plate 17 will be effectuallyprevented.

In actual practice the plate 17 is arranged in position as clearly shownin Figures 1 and 2, that is with the plate 1'7 overlying a portion ofthe dial 13, with the lock secured to the plate 17, and the bolt 23thereof extending through alined openings 19 and 14. When in saidapplied position, the free end of the plate 17 extends between the dial13 and that part of the hook 15 that overlies the dial 13 with the shankor vertical portion of the hook being disposed between the base 12 andan end portion of the flange 18 in the manner shown in Figure 1, and toabut the short straight end edge 17' of the plate with the shank of thehook 15. When the bolt 23 of the lock is turned to the locking positionshown in Figure 4 the plate 17 will thus be secured in position and itwill be impossible for the screws 16 that secure the hook 15 to the base12 to be removed. It will thus be seen that only the subscriber or someauthorized person holding the key of the lock 20 will be. able to makeuse of the phone for outgoing calls.

Even though I have herein shown and described the preferred embodimentof the invention, it is to be understood that the same is susceptible offurther changes, modifications and improvements coming within the scopeof theappended claim.

Having thus described my invention, what I claim as new is:

A look for dial telephones comprising in combination, a dial telephonehaving a base upon which a dial is rotatably mounted; a finger stop hookhaving a shank secured by screws to the telephone base and a fingerengaging piece extending from the shank and overlying the dial; a diallock having a fiat arcuate plate adapted to rest on the dial with oneend of the plate disposed between the dial and the finger engaging pieceof said stop hook, said plate having at the convex edge thereof adepending flange adapted at one end thereof to overlie the shank andsecuring screws therefor to preclude unauthorized removal of the screws;said plate and flange at one endthereof being also mutually l separatedto accommodate the shank of the stop, and a straight short end edgeportion on the plate inwardly from the free end of the flange adapted toabut the shank of said stop hook; and a lock mounted vertically on theplate and including a key operated member extending through an aperturein the plate far enough to engage a hole of the dial and being of adiameter slightly less than that of the hole to prevent shifting of thequired to give access to screws.

JOSEPH JACKSON.

plate the distance rei said shank securing

